17. Marketing: Sporting Goods A marketing consultant was hired to visit a random sample of five sporting goods stores across the state of California. Each store was part of a large franchise of sporting goods stores. The consultant taught the managers of each store better ways to advertise and display their goods. The net sales for 1 month before and 1 month after the consultant’s visit were recorded as follows for each store (in thousands of dollars):

Store 1 2 3 4 5 Before visit 57.1 94.6 49.2 77.4 43.2 After visit 63.5 101.8 57.8 81.2 41.9 Do the data indicate that the average net sales improved? (Use a 5 0.05.)